TOPIC: Images sorting + expire deleting

i have uploaded some pictures of cars for a local firefighter website. best for us is when the first image is from the front of the car. but the sorting change every time i refresh site. it is possible to sort the images? or change/fix the sort-style?

second question is about teh expire date:
i use the component for a car-directory and i dont want have a expire date.. can i set a expire-date global off or you have another solution to keep them online?